A Plusnet spokesperson added: “We’d like to apologise to our customers as we know this isn’t the service they’ve come to expect from us.

"A small number of customers had issues following the launch of our new billing system at the end of last year. This meant our customer service centres saw an increase in calls, so customers had to wait longer than usual to speak to an advisor.

"This report refers to complaints during that time in October to December, since then we’ve been working hard to get things back on track and the most recent complaints data shows that we are heading in the right direction.”

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